CN1052026C - Magnetic recording media - Google Patents

Magnetic recording media Download PDF

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Publication number
CN1052026C
CN1052026C CN94104825A CN94104825A CN1052026C CN 1052026 C CN1052026 C CN 1052026C CN 94104825 A CN94104825 A CN 94104825A CN 94104825 A CN94104825 A CN 94104825A CN 1052026 C CN1052026 C CN 1052026C
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CN
China
Prior art keywords
magnetic
resin
composition
copolymer resin
magnetic recording
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Expired - Fee Related
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CN94104825A
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Chinese (zh)
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CN1093726A (en
Inventor
C·B·马龙
J·R·哈维
C·F·尼科林尼
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Union Carbide Chemicals and Plastics Technology LLC
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Union Carbide Chemicals and Plastics Technology LLC
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Publication of CN1093726A publication Critical patent/CN1093726A/en
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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
    • G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
    • G11B5/702—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the bonding agent
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
    • G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
    • G11B5/702—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the bonding agent
    • G11B5/7023—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the bonding agent containing polyesters, polyethers, silicones, polyvinyl resins, polyacrylresins or epoxy resins
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/90—Magnetic feature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31551—Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
    • Y10T428/31609—Particulate metal or metal compound-containing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/31935—Ester, halide or nitrile of addition polymer

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  • Paints Or Removers (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Magnetic Record Carriers (AREA)

Abstract

This invention relates to coating compositions used for forming a magnetic layer on the surface of substrates to prepare magnetic recording media, e.g., recording tapes, of which the characteristic ingredient is a copolymeric resin. The copolymeric resin is a copolymer obtained by the copolymerization of comonomers in a specified proportion including (1) vinyl chloride, (2) vinyl acetate, and (3) an acrylate or methacrylate moiety having a sulfonic acid group or a metal or amine salt thereof. This copolymeric resin is advantageous in respect of imparting enhanced dispersion and magnetic property characteristics while also having desirable rheological characteristics and thermal stability.

Description

Magnetic recording media and the magnetic application composition that is used for this medium
The present invention relates on the magnetic recording media to form the used application composition of magnetosphere, relate in particular to that be used as in the application composition can homodisperse and the resin of suitable bonding ferromagnetic material particulate binding agent composition.The invention still further relates to magnetic recording media.
Magnetic recording occupies critical positions for many years in unnumbered industrial trade.Tape therefore is used for audio frequency, video, computer, instrument and other record aspects.Magnetic recording media can use by various forms, for example comprises magnetic card and disk, tape reel, video band, high-performance voiced band, computer band, floppy disk etc.
Though several dissimilar magnetic recording medias are arranged, and modal type is made up of one deck magnetic-particle, sometimes it is called " coating ", it is coated on plastics, paper or the metal matrix.The information storage that is recorded is recorded magnetic head and is magnetized into a series of little magnetic domain on the magnetic coating that is coated on the matrix.The coat of magnetic coating comprises a kind of binder system, and this system provides the binder of viscosity between the magnetic coating particle, and with this particle adhesion on matrix.
Magnetic coating can be applied on the matrix with the coating equipment such as photogravure roller applicator, and the matrix band of Tu Fuing usually carries out the magnetic aligning step immediately then, and in this step, the orientation of coating particles is to carry out on undried layer.In this step, coating particles usually is that the major axis of needle-like crystal will make it consistent with direction of magnetization.
In order to obtain good record performance, magnetic coating must have diversified characteristic.Coating particles requires to have suitable homogeneous granules size, should form coating with high as far as possible ratio.Moreover the dispersity of coating particles is often assessed with glossiness in the coating, should be high as much as possible.Also have, the coating particles of high dispersing must be oriented (orientation degree is often measured with " verticality ") suitably by aforementioned.
Also have, the adhesivity of magnetic coating or film and abrasion resistance should be high.Magnetic surface also should be low to the coefficient of friction of magnetic head materials, and anti-enough value such as gear and capstan wheel driving medium also will be arranged.
Make the standard of these and other some inequalities all be satisfied then show to be relative basically, obtain a kind of delicate balance in the opposite in other words conj.or perhaps character.People make great effort be devoted to improve magnetic recording media various characteristics for many years already.
U.S. Patent No. 4851465 discloses a kind of multipolymer that can be used for magnetic coating, it is made up of the following units: (1) at least 60% (weight) vinylchlorid unit, (2) 0.1-4.0% (weight) contains the strong acid group monomeric unit as the strong acid group of sulfur-bearing or phosphorus, (3) at least 0.1% (weight) are as the monomeric unit of the side chain of the energy production-X-OH representative of hydroxyl, wherein X is an organic group, and another monomeric unit of (4) 0-20% (weight).
EPA-0-385-715 A2 discloses has magnetospheric magnetic recording media, and described magnetosphere comprises vinyl chloride copolymer and makes binding agent and magnetic powder, and forms on non-magnetic carrier.Described binding agent is (a) and the mixture that (b) constitutes, described (a) is the vinyl chloride copolymer that contains quaternary ammonium salt and hydroxyl, and (b) is to contain at least one to be selected from the anionic hydrophilic group of carboxylic acid, sulfur acid, phosphoric acid and salt thereof and the vinyl chloride copolymer of hydroxyl.The ratio of multipolymer (a) and multipolymer (b) should with can make that the ratio of quaternary ammonium salt in the multipolymer (a) and the anionic hydrophilic group in the multipolymer (b) is that the ratio of 0.2-5 is suitable.
FR-2,584,522 disclose a kind of the have magnetisable coating of non-magnetic substrate and magnetic powder and the magnetic recording media of binding agent.Its novel part is that this binding agent contains vinylchlorid and the multipolymer with vinyl compound of tertiary amine sulfonate or tertiary amine sulphate esters group.
Basis of the present invention is a kind of like this announcement: can be by utilizing a kind of vinylchlorid, and vinyl-acetic ester and contain sulfonic acid group-SO 3The mode of the acrylate of H or its metal or amine salt or the multipolymer of methacrylic ester, provide a kind of binder system to be used for this particular matter, such as magnetic recording media, it can be given with dispersiveness that meets the requirements and magnetic properties and also have excellent rheological characteristics.
The purpose of this invention is to provide a kind of magnetic application composition that is used for magnetic recording media.
A further object of the present invention provides magnetic recording media.
The present invention relates to be used for the magnetic application composition of magnetic recording media, their dissolve or are dispersed in the organic solvent, and described composition comprises:
(A) contain the copolymer resin of following monomer segment:
(a) chemical formula is-CH 2First monomer segment of the vinylchlorid of-CHCl-,
Preferred by weight 65-95%;
(b) chemical formula is-CH 2-CH (O-CO-CH 3)-vinyl-acetic ester
Second monomer segment is preferably 3-30% by weight;
(c) contain-SO 3The acrylate of H sulfonic acid group or its metal or amine salt
Or methacrylic ester, but not the 3rd monomer portion of methacrylic acid sulfo methyl ester
Divide the preferred 0.1-5% of its weight; And
(B) be dispersed in as the ferromagnetic material particle in vectorial copolymer resin.
The invention provides economic fluoropolymer resin, its suit subparticle of in the magnetic application composition homodisperse and the ferromagnetic material that firmly bonds.The present invention also provides application composition, makes it form magnetosphere by using above-mentioned resin on membrane surface as the ferromagnetic particle binding agent.
Fluoropolymer resin provided by the invention prepares magnetic recording media as ferromagnetic material particulate binding agent in application composition, it is a kind of copolymer resin by a kind of interpolymerization generation of monomer miscellany, this monomer mixture comprises (1) vinylchlorid, and the acrylate or the methacrylic acid ester moiety of sulfonic acid or its metal or amine salt contained in (2) vinyl-acetic ester and (3).
The monomer segment that constitutes this copolymer resin comprises that (a) chemical formula is-CH 2First monomer segment of-CHCl-vinylchlorid; (b) chemical formula is-CH 2-CH (O-CO-CH 3)-second monomer segment of vinyl-acetic ester; (c) contain sulfonic group-SO 3The 3rd monomer segment of the acrylate of H or its metal or amine salt or methacrylic ester.The parts by weight of these monomer segments are preferably: (a) being 65-95%, (b) is 3-30%, and (c) is 0.1-5%.
Preferably multipolymer mean polymerisation degree (homopolymerization degree) scope is 200-800 in addition.
This copolymer resin is considered as the binder of magnetic coating, ferromagnetic particle therein high degree of dispersion and be very useful to the high-load degree aspect of ferromagnetic powder.In addition, this copolymer resin safely challenges comparison with and is conventionally used as the resins such as polyurethane of magnetic coating binder resin, so application composition of the present invention not only can use the fluoropolymer resin that is defined as above separately but also itself and other can be had to improve latter's character and combine to make as the conventional resin of purpose and be used for preparation.Moreover the magnetic coating that application composition of the present invention provides has excellent properties aspect magnetic properties and the work reliability two, and reliability is the wearing quality when using and the thermostability of disappearance aspect in time.
To obtain the homopolymerization degree be that the multipolymer method of 200-800 can get fluoropolymer resin of the present invention by above-mentioned monomer is carried out copolymerization with the miscellany form.The monomer segment that constitutes this fluoropolymer resin comprises:
(a) first monomer segment of the vinylchlorid of 65-95% by weight, chemical formula-CH 2-CHCl-;
(b) second monomer segment of the vinyl-acetic ester of 3-30% by weight, chemical formula-CH 2-CH (O-CO-CH 3)-;
(c) by weight 0.1-5% contain sulfonic group-SO 3The 3rd monomer segment of the acrylate of H or its metal or amine salt or methacrylic ester;
(d) one or more other monomer segments of 0-20% by weight.
First monomer segment, promptly by the vinylchlorid deutero-partly, normally main component is decided by it for the necessary competent mechanical property of rational function in things such as magnetic recording media as resin glue.Therefore, use a certain amount of vinylchlorid so that it is very necessary that the needed characteristic of resin enough is provided, the Tg of the used resin of reference can be enough to determine this characteristic.
Use a certain amount of vinylchlorid,, be preferably and have about at least 50 ℃ Tg, be more preferred from about at least 70 ℃ Tg so that the Tg that enough makes resin of the present invention have at least 40 ℃ generally is desirable.Therefore must use the resin that contains about at least 70% weight vinylchlorid.More preferably wish to use the vinylchlorid that contains about 90% weight of about 80-.Surpass about 90% weight inappropriate solubleness is then arranged in conventional solvent.When the weight content of this monomer segment was too low, then some was poor in mechanical properties for the coating that is formed by this application composition.When its weight content is too high, then in the application composition preparation,, fluoropolymer resin solubleness in organic solvent meets difficulty owing to reducing.
Second kind is that vinyl acetate monomer weight content scope partly should be 3-30%, preferred 3-15%.Can cause when the weight content of vinyl acetate ester moiety is too big that physical strength and thermostability reduce in the coating that this application composition generates, this will exert an influence to the wearing quality of its magnetic recording media that makes.
The 3rd monomer segment is acrylate or methacrylic ester, and the sulfonic acid group that they contain both can also can exist with metallic element or the salifiable form of amine by free acid form.This monomer segment in application composition to increasing the dispersed helpful of ferromagnetic particle.In this respect, although its weight content surpasses 5% not useful especially effect, it still should be at least 0.1%.The method that such monomer segment is introduced into copolymer resin is to contain undersaturated the gathering property group of a kind of olefinic and a kind of-SO 3The monomer of X sulfonic acid group carries out copolymerization, and wherein X is a hydrogen atom, an atoms metal such as alkali metal atom, or a protonated amine.The suitable monomers example comprises acrylate and methacrylic ester, can be expressed as following structural: i.e. CH 2=CH-CO-O-C 4H 8-SO 3X; CH 2=C (CH 3)-CO-O-C 2H 4-SO 3X; Wherein X is a hydrogen atom, basic metal such as sodium and potassium atom, or protonated amine; Or the like.
Other monomer segments that can be used in the fluoropolymer resin of the present invention comprise, for example vinyl carboxylates such as propionate; Vinyl Ether such as methylvinylether, isobutyl vinyl ether and hexadecyl Vinyl Ether; Vinylidene halide such as vinylidene chloride and and vinylidene fluoride; Unsaturated carboxylic acid such as vinylformic acid, methacrylic acid, toxilic acid and methylene-succinic acid; Unsaturated carboxylic acid anhydrides such as maleic anhydride; Esters of unsaturated carboxylic acids such as ethyl maleate; Toxilic acid butyl benzyl ester, dimethyl itaconate, (methyl) methyl acrylate, (methyl) ethyl propenoate and (methyl) lauryl acrylate; Unsaturated nitrile is as (methyl) vinyl cyanide; And aromatic ethenyl compound such as vinylbenzene, alpha-methyl styrene and to vinyltoluene.
Is 200-800 by above-mentioned comonomer through its preferred homopolymerization degree scope of copolymerization gained copolymer resin.When its homopolymerization degree too hour, the magnetic recording media that contains useful this multipolymer composition prepared magnetic coating can not obtain enough physical strengths and wearing quality.When its homopolymerization degree is too big, have the viscosity of increase with this multipolymer with the application composition of desired concentration preparation, for workability aspect attack with this application composition.
The copolyreaction of comonomer can be undertaken by any known method, comprises suspension polymerization, emulsion polymerization method, solution polymerization process and mass polymerization etc.If desired, the vinyl acetate ester moiety can substitute with propionate or other low-grade carboxylic acids' vinyl acetate in the multipolymer.
The conventional soln polymerization technique, as discussed below, can be with generating resin glue of the present invention with meeting the requirements.Equally, also can use other polymerization technique, suspend or the emulsion polymerization technology such as routine.Therefore not strict to the preparation technology that resin of the present invention adopted, these technology are all known those skilled in the art.For example, Shi Yi technology of preparing is listed in U.S.3755271.
Generally speaking, the example of property as an illustration, available solution polymerization prepares resin of the present invention, uses a kind of solvent that is suitable for gained resin and used various compositions this moment.Suitable solvent for example comprises conventional ester solvent, as butylacetate, and ethyl acetate, isopropyl acetate etc., and ketone solvent, as acetone, methyl ethyl ketone, methyl n-butyl ketone, Methyl isobutyl ketone etc.
Polyreaction both can also can be carried out in batches continuously.The ratio of solvent/monomer changes between about 0.3/1～about 4/1 usually, depends on desired molecular weight.Selected range of temperature is about 35～about 80 ℃, depends on speed of reaction and desired molecular resin amount.The molten radical catalyst of any oil all can use, and its amount ranges changes between about 0.01-about 3% of monomer weight.The example of property as an illustration, appropriate catalyst comprises dibenzoyl peroxide, dilauroyl peroxide, azo dibutyronitrile and cross two carbonic acid diisopropyl esters.Any pressure on the vapour pressure of this each composition of system all can adopt, and pressure range is about 207-690 kPa (KPa) usually.
Can use any matrix or substrate, deciding according to concrete application when selecting particular substrate is the parts of using always.Poly-terephthaldehyde's glycol ester and polypropylene film are widespread uses as the substrate material of magnetic recording media.Can use polyimide film, polyamide membrane, polyaryl ether film etc. when biasing toward heat-resisting consideration.Under the situation of polyester film, usually after single shaft or diaxial orientation, use as thin matrix.The processing of giving of film is of value to promotion infiltration and adhesion, and this is well-known equally.
Magnetic-particle can be any known and be used in material in the conventional magnetic recording media.Representational example comprises needle-like or granulous γ-Fe 2O 3, Fe 3O 4, mix γ-Fe of Co 2O 3, mix the γ-Fe of cobalt 2O 3-Fe 3O 4Sosoloid, the γ-Fe of cobalt-based compound absorption 2O 3, the Fe of cobalt-based compound absorption 3O 4(comprise that those are at himself and γ-Fe 2O 3Between be oxidized to the material of intermediate state) and acicular CrO 2(term cobalt-based compound means cobalt oxide in this article, cobaltous hydroxide, and vectolite, cobalt ion adsorptive etc., they can make magnetic-particle make cobalt obtain the benefit of magnetic anisotropy aspect its coercive force improving).Magnetic-particle is sexangle or acicular strontium or barium ferrite also.Magnetic-particle can also be ferromagnetic metallic element or alloy, such as Co, and Fe-Co, things such as Fe-Co-Ni.The available many modes of the preparation of these fine magnetic-particles are carried out, and comprise raw material is used such as NaBH 4The reductive agent reduction reaction that wets, iron oxide surface is handled with silicon compound, does reduction reaction and vacuum-evaporation in low-pressure argon stream with hydrogen etc. subsequently.Also can adopt the subparticle of monocrystalline barium ferrite.This fine magnetic can needle-like or the granular particle form use, depend on the application of gained magnetic recording media.
Using quite a large amount of magnetic-particles in the coating all is desirable usually.Thereby the exemplary composition of coating comprises about 65 or 70～about 85 or 90% magnetic-particle, and this is with the gross weight metering of coating.As everyone knows, use relatively that the coating particles of uniform-dimension is desirable, the particle major axis of usefulness is about 0.4 micron or even littler usually.
All the other materials of coating comprise binder system, and this binder system comprises hardening resin and common elastomeric polymer, randomly a kind of dispersion agent, randomly a kind of linking agent and any optional adjuvants.The used resin according to the present invention, dispersion agent can reduce to minimum or even not use.
Yet except that coating particles, be hardening resin self according to the only additional basal component imagination of the present invention.But common coating regular meeting comprises additional distinctive composition according to the final application of special purpose.When a certain amount of combination was used in the conventional formulation for coating material with it, its excess of coating existed in coating wt general about 10 or 15～30 or 35%.
When preparing the magnetic application composition as ferromagnetic particle vehicle with above-mentioned special multipolymer, this copolymer resin can be used in combination jointly with other fluoropolymer resins that are conventionally used for the preparation magnetic recording media, and other resins are with in a small amount as 50% weight or use more in a small amount.Be suitable for this fluoropolymer resin example that is used in combination and comprise polyurethane resin, nitrocotton, Resins, epoxy, polyamide resin and resol also have the polymkeric substance and the multipolymer of following material: vinylformic acid and methacrylic ester, vinylbenzene, vinyl cyanide, divinyl, ethene, propylene, 1, the 1-Ethylene Dichloride, acrylamide, Vinyl Ether etc.; Wherein preferred especially polyurethane resin and nitrocotton.
In preferred embodiments, the binder system general requirement comprises the elastomeric polymer of q.s, so that the coating with desired elasticity etc. is provided.For this purpose, many elastomeric polymers are all known and can use.Usually preferred polyurethane during for performance application.Suitable material all is commercial on sale.The general available polyvalent alcohol ester of these materials, the reaction product of short-chain diol and isocyanic ester is described.These resins have excellent toughness and antiwear characteristic.
Various polyisocyanate crosslinking agents is all known and can use.The prevailing polymeric polymeric polyisocyanate that is to use.In one embodiment, it is suitable using polymeric tolylene diisocyanate adducts (TDI).The amount of used linking agent is counted about 1-about 25% with the weight of vinyl chloride copolymer and polyurethane in the prescription usually.
Polyisocyanate crosslinking agent is used in the magneticmedium prescription usually to improve such as hardness tensile strength, character such as second-order transition temperature.Because these polymkeric substance do not contain and are considered to make the group of reaction towards isocyanic ester, are considered to same improving effect so contain the prescription of polymkeric substance of the present invention, this point exceeds to give material.Although do not wish to be subjected to the constraint of any specific theory or mechanism, can believe that some isocyanic ester can generate amine with the water reaction at least, then amine and other isocyanate reaction generation interpenetrating(polymer)networks.This interpenetrating(polymer)networks can partly help to improve some performances that magnetic recording media prescription of the present invention is showed.
As everyone knows, many auxiliary agents will be used in the magnetic coating sometimes.If when needing in specific application, these additives all are known and all can use.Magnetic application composition for example of the present invention, it is ferromagnetic particle uniform basically dispersion in as vectorial fluoropolymer resin, this composition can be further mixed with the various known additive that routine is used in the magnetic application composition, and additive comprises lubricant, dispersing auxiliary, rust-preventive agent, static inhibitor, levelling agent, anti-wear agent, film tougheners etc., the consumption of each is all limited.The magnetic application composition can be used organic solvent diluting, so that provide a suitable viscosity or denseness makes it to be suitable for coating processes.The appropriate organic solvent example comprises methylethylketone, mibk, toluene etc.
According to the present invention, magnetic coating has used resin of the present invention just to make coating obtain necessary dispersion and orientation characteristic, and resembles and work the hardening resin.Other hardening resins of unnecessary employing; Yet if desired, resin of the present invention can use with compatible hardening resin, so that obtain desired magnetic coating.
According to the present invention, use resin of the present invention then to obtain dispersion and the orientation characteristic that improves.Yet if desired, can use other conventional dispersion agents.
The preparation of magnetic recording media generally is that binder system is dissolved in a kind of abundant evaporable vehicle, to obtain a kind of dispersion of the magnetizable particles that applies.Then dispersion is coated in and obtains on-chip coating on the substrate.Magnetic recording media can be used in the art disclosed method preparation, for example see that S.Tochihara shows " Magnetic Coatings and TheirApplications in Japan ", Progress in Organic Coatings, 10 (1982), the 195-204 page or leaf.
Embodiment preferred of the present invention provides a kind of magnetic recording media, it comprise substrate and on magnetic recording layer, this layer comprises solidified binder system and magnetic-particle.Include copolymer resin in the described binder system, this resin comprises following monomer segment: (a) vinylchlorid; (b) vinyl-acetic ester; (c) contain sulfonic acid group-SO 3The acrylate of H or its metal-salt or amine salt or methacrylic acid ester moiety, but except the methacrylic acid sulfo methyl ester; The homopolymerization degree of described copolymer resin is in the 200-800 scope.The content of this resin is enough to strengthen the dispersing characteristic of magnetisable coating.In another embodiment preferred of the present invention, the content of copolymer resin, in per 100 weight part ferromagnetic material particles, its scope is the 8-30 weight part.
Zhi Bei magnetic application composition of the present invention can be coated onto on the various forms of substrate surfaces in the above described manner, and the substrate form is a film, band shape, thin slice, tinsel, thin plate or the like; Substrate material is various, there is no particular restriction, comprises synthetic resins such as polyester, polyolefine, rhodia, polycarbonate etc., nonmagnetic material such as aluminium, and pottery.The coating processes that uses magnetic application composition of the present invention can be any known method that is conventionally used for the preparation magnetic recording media, carries out subsequently such as the surface treatment of rolling to improve the slickness of the desired coated surface of high-performance magnetism recording medium.
Though use resin of the present invention can in magnetic recording media, obtain particularly advantageous characteristic, and narrated the present invention in conjunction with this application, but will be appreciated that: this material can be used as dispersion agent and/or hardening resin equally in any other can embody the application of this resin properties with meeting the requirements.For example, conventional rich zinc applies and can be used in many application that require protection against corrosion etc.Compositions for use generally includes the zinc particle (until 85～90%, with composition weight meter) and the resin of high per-cent, and with the optional component such as the antisettling agent of this resin, thickening material and water scavengine agent, these are all known.For supercoat and other limpid and painted coatings of rich zinc, the dispersiveness that any resin of the present invention all can provide improvement has therefore improved the adhesivity to substrate.So resin of the present invention can be used in combination with this coating easily.
Some embodiment of below will be by copolymer resin preparation and being used for preparing magnetic recording media describes the present invention in detail.
Embodiment
The following example is to illustrate and also unrestricted the present invention.Raw materials used, used abbreviation, the assessment of comparative resin, used polymerization process, the preparation and the technical evaluation in the subsequent embodiment of magneticmedium preparation are as follows.
Used abbreviation language
Following abbreviation is with among the embodiment hereinafter:
VCl-vinylchlorid
The VAc-vinyl-acetic ester
SEMA-methacrylic acid sulphur ethyl ester
The HPA-Propylene glycol monoacrylate
AMPS-1-acrylamido-2-methyl propane sulfonic acid
TPU-1-thermoplastics type polyurethane, Morton Iuternational company is on sale, Chicago, Illinois, commodity are called Morthane CA-239.
TPU-2-thermoplastics type polyurethane, Morton Internatioual company is on sale, Chicago, Illinois, trade(brand)name Morthane CA-236.
The PIC-polyisocyanate crosslinking agent, Miles Inc. company is on sale, Pittsburgh, Pennsylvania, trade(brand)name Mondur CB-75.
The polymerization technique vinyl chloride copolymer
The preparation of vinyl chloride copolymer is to carry out through the successive solution polymerization in the stainless steel tank reactor that band stirs.Vinylchlorid and other used monomers and solvent are given first mixing, and infeed reactor continuously.Free-radical initiator is promptly crossed two carbonic acid diisopropyl esters and is also infeeded continuously with the acetone soln form, and its speed must make to transform and keep constant.Send continuously in the product solution autoreactor.Reactor temperature remains on 50-60 ℃, and pressure remains between the 620-758KPa simultaneously.The product solution stripping is removed unreacted vinyl chloride monomer.Reclaim polymkeric substance with coprecipitation mode from solution with the isopropanol miscellany then, filter, in the thermopnore moisture eliminator, carry out drying.
The planetary stirrer mixer of metallic paint high-shear is used in the preparation of magneticmedium preparation:
With metallic paint (Dowa Mining company limited, Tokyo, Japan, trade(brand)name HIQ-1,469 grams) the two planetary mixers of the 1.5 liters of Premier/Inoue that pack into.The ethenoid resin solution (solution of 20% solid particulate of 322 grams in mixed solvent, solvent is methylethylketone/pimelinketone/toluene of 1: 1: 1) and the other mixed solvent of 215 grams of the vinyl-chloride-containing multipolymer in the table 1 are added together.It is the solid master batch that each composition in the mixing tank was generated a kind of about 53% in mixed 20～24 hours.Fat grinds:
On decollator, made solid reduce to 35% in mixed about 1 hour with the mixed solvent of 499 grams with master batch (970 gram).Its that afterwards miscellany is put into one 0.75 liter fills the Premier HML horizontal mill of the granulated glass sphere of 0.85-1.15mm, grind continuously, until preparation through 3 times by till the shredder.Discharge:
To take out in the preparation self-grind machine subsequently, and mixing with the solution of 246 gram TPU-120% solid particulates in mixed solvent on the decollator.Other adds mixed solvent (41g) solid is reduced to 32%.With pack into once more shredder and carry out 2 scatter operations of this miscellany.
In a word, solid is 53% in planetary mixer; In fat grinds is 35%; Be 32% in discharge.(vinyl chloride copolymer+TPU-1) is 80/20 to final coating/binding agent by weight.(vinyl chloride copolymer+TPU-1) is 55/45 to binding agent by weight.Use magnetite
Prepare preparation according to the following steps: hereinafter 18.25 grams of the ethenoid resin in the table 1 give mixed with the mixed solvent of 285 grams, solvent is methylethylketone/toluene/pimelinketone, its ratio is 45/30/25, add 125 gram magnetite (trade(brand)names " BayferroxPK5143M " again, magnetic coating, Miles Inc. company produces, Pittsburgh, Pennsylvania).Miscellany after fully mixing about 10-15 minute with air agitator is added to the gained slurry with grinding 45 minutes in the Premier SME RE II shredder of 1.3mm granulated glass sphere filling.Add TPU-2 to preparation, 20% solution of 60.8 grams, this solution solvent for use is methylethylketone/toluene/pimelinketone (45/30/25).Afterwards preparation was ground 30 minutes.
The vinyl chloride copolymer assessment
Logarithmic viscosity number
Measure logarithmic viscosity number according to ASTM D-1243
Second-order transition temperature (Tg), tensile strength and unit elongation
Indicated ethenoid resin 18 grams in the Table I are added in the vial, add 40 gram tetrahydrofuran (THF)s then, 15 gram methylethylketones and 15 gram toluene.Then vial is placed on the inclusion of rolling on the roller, until each composition dissolving.In bottle, add 12 gram TPU-1.Bottle is placed extremely dissolving of rolling inclusion on the roller.Add the linking agent system in bottle, the PIC of 7.5 grams puts bottle in the extremely dissolving of roller rolling inclusion.Solution is taken from roller and is full of air, makes its sedimentation, shrinks again.
For measuring tensile property, on separation paper, make liquid shrinkable, use 50 microns shrink strips.Measure for carrying out glass transformation temperature (Tg), methylethylketones by adding each 20 gram to solution and toluene also are rolled to roller and evenly make sample.The solution of this dilution is poured on the Masslinn towel also with ligulate depressor (tongue depressor) expansion.Passing towel with glass stick pulls out and makes its solution that distributes equably.After dry 30 minutes, solution is poured on the towel and again by above-mentioned expansion.Two samples of tensile strength and glass transformation temperature (Tg) in 60 ℃ of air circulation ovens dry 48-72 hour.Carry out final drying at 130 ℃ subsequently and after 5 minutes, sample is surveyed tensile strength and unit elongation on the Instron experiment instrument, on the dynamic mechanical analysis instrument, survey glass transformation temperature (Tg).The about 0.6mm of the sample of tensile strength and unit elongation is thick * and the 25.4mm standard is long.Pinblock speed: 12.7mm/ minute.
Magneticmedium assessment glossiness
The mode of assessing this is the liquid shrinkable of making 1 mil on glass, makes preparation at air drying, surveys glossiness with 60 ° of glossiness survey meters then.
(LDJ company, Troy Michigan) carry out other magnetic parameters and measure, and applying magnetic field is 3000 or 5000 oersteds with LDJ type 7000A B-H survey meter.Measure the sample of these magnetic propertiess,, then this Mylar is drawn through a bar magnet and make magnetic grain orientation by on the Mylar substrate, being coated with the wet shrinkage layer of one deck 3 mils.51 * 51mm sample of this orientation back coating is used for measuring its magnetic properties.
Turn to field distribution (Switching Field Distribution)
This index is surveyed its width by half eminence at the magnetic hysteresis loop of differential, and width is determined divided by coercive force.
The orientation rate
The remanent magnetic flux density on preferred (orientation) direction divided by be coated with find on the layer plane perpendicular to the remanent magnetic flux density on preferred (orientation) direction, determine this parameter with this ratio.
The verticality ratio
Magnetic verticality or verticality ratio are determined the ratio of maximum magnetic flux induction (Bm) with remanent magnetism (Br).
Embodiment 1-5 and comparative example A
The preparation vinyl chloride copolymer, composition that it has (weight percent) and viscosity are listed in following Table I.
Table I
The embodiment Comparative Examples forms 12345 AVCl, 86 86 86 86 84 88VAc, 13.1 12.8 12.4 11.9 12.7 4HPA------------AMPS----------1 characteristic logarithmic viscosity number 0.35 0.41 0.37 0.50 0.36 0.51 that 7SEMA 0.9 1.2 1.6 2.1 3.3
Comparative example A's multipolymer is stored in envrionment temperature with the solution form of 25% solid particulate in acetone.As seen optical haze enlarges naked eyes in several days.Sediment has been formed on the inherent storage vessel of solution bottom after 50 days.Collect this sediment and analysis, discovery is B, B-diformazan taurine, H 3N-C (CH 3) 2-CH 2-SO 3Reclaim polymkeric substance and carry out the AMPS analysis from solution.Find that content is about 20%, under initial content when putting into solution.This explanation AMPS molecule is degraded in solution, is directed at B, the disengaging of B-diformazan taurine.The multipolymer of embodiment 1-5 contains methacrylic acid sulphur ethyl ester, does not have the sign of degraded in the expression solution.
Preparation contains ethenoid resin certain in the Table I, TPU-1 and PIC preparation, and the characteristic that they have is listed in following Table II, III and IV.
Table II
Glass transformation temperature
Tg is ℃ by the resinous ethenoid resin ethenoid resin of embodiment and ethenoid resin and preparation TPU-1 TPU-1 and PIC 1 76 68 78 2 74 67 76 3 76 64 78 4 77 66 77 5 77 63 80
Table III
Tensile strength
Tensile strength, KPa is by the resinous ethenoid resin ethenoid resin of embodiment and ethenoid resin and preparation TPU-1 TPU-1 and PIC 1 44,000 38,000 53,000 2 41,000 45,000 52,000 3 25,000 33,000 44,000 4 45,000 38,000 55,000 5 14,000 21,000 35000
Table IV
Unit elongation
Unit elongation, per-cent is by the resinous ethenoid resin ethenoid resin of embodiment and ethenoid resin and preparation TPU-1 TPU-1 and PIC 1 10 200 180 2 120 260 260 32 170 200 4 150 160 180 51 50 90
With some resins magnetic recording media in the Table I.Its characteristic is listed in following Table V and VI.
Table V
Metallic paint turns to field distribution orientation rate 1 128 0.84 0.45 1.9 2 130 0.88 0.45 2.3 3 109 0.83 0.48 1.7 4--------5 115 0.87 0.47 2.3 by the medium glossiness ratio of 60 ℃ of perpendicularity systems of embodiment resin
Table VI
Magnetite turns to field distribution orientation rate by the medium glossiness ratio of 60 ℃ of verticality systems of embodiment resin
1 -- -- -- --
2 96 0.88 0.38 2.1
3 88 0.87 0.40 2.0
4 98 0.88 0.41 2.0
5 94 0.89 0.39 2.0
Although the present invention has been described with aforementioned some embodiment, be limited absolutely not, but the present invention topped similar scope disclosed above.Can make various improvement and design and not break away from the spirit and scope of the present invention.

Claims (8)

1. magnetic application composition that is used for magnetic recording media, its dissolving or be dispersed in the organic solvent, described composition comprises:
(A) a kind of copolymer resin comprises following monomer segment:
(a) vinylchlorid; (b) vinyl-acetic ester; (c) a kind of sulfonic acid group-SO that contains 3The acrylate of H or its metal or amine salt or methacrylic acid ester moiety, and except the methacrylic acid sulfo methyl ester; The mean polymerisation degree scope of described copolymer resin is 200-800; And
(B) be dispersed in as the ferromagnetic material particle in vectorial copolymer resin.
2. magnetic recording media, comprise substrate and on magnetic recording layer, this layer comprises solidified binder system and magnetic-particle, comprises the copolymer resin in the claim 1 in the said binder system, and the amount of this resin enough strengthens the dispersing characteristic of said magnetisable coating.
3. according to the magnetic application composition of claim 1, wherein as the copolymer resin amount of composition (A), in per 100 parts of ferromagnetic material particle weight as composition (B), its scope is 8-30 part weight.
4. according to the magnetic application composition of claim 1, wherein the chemical formula of acrylate or methacrylic acid ester moiety is CH 2=C (CH 3)-CO-O-C 2H 4-SO 3X, X wherein is a hydrogen, basic metal or protonated amine.
5. magnetic application composition that is used for magnetic recording media, its dissolving or be dispersed in the organic solvent, described composition comprises:
(A) a kind of copolymer resin, it comprises following monomer segment:
(a) the first monomer segment vinylchlorid of 65-95% weight, chemical formula-CH 2-CHCl-;
(b) the second monomer segment vinyl-acetic ester of 3-15% weight, chemical formula-CH 2-CH-(O-CO-CH 3)-; With
(c) the 3rd monomer segment of 0.1-5% weight promptly contains sulfonic acid group-SO 3The acrylate of H or its metal or amine salt or methacrylic ester, and except the methacrylic acid sulfo methyl ester; The mean polymerisation degree scope of described copolymer resin is 200-800; And
(B) be dispersed in as the ferromagnetic material particle in vectorial copolymer resin.
6. magnetic recording media, comprise substrate and on magnetic recording layer, this layer comprises solidified binder system and magnetic-particle, comprises the copolymer resin in the claim 5 in the said binder system, and the amount of this resin enough strengthens the dispersing characteristic of said magnetic coating.
7. according to the magnetic application composition of claim 5, wherein as the copolymer resin amount of composition (A), in per 100 parts of ferromagnetic material particle weight as composition (B), its scope is 8-30 part weight.
8. according to the magnetic application composition of claim 5, wherein the chemical formula of acrylate or methacrylic acid ester moiety is CH 2=C (CH 3)-CO-O-C 2H 4-SO 3X, X wherein are hydrogen, basic metal or protonated amine.
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Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1068132C (en) * 1996-02-02 2001-07-04 刘中原 Magnetic size for coating high coercive force prepayment magnetic card and its preparing method
US6455146B1 (en) 2000-10-31 2002-09-24 Sika Corporation Expansible synthetic resin baffle with magnetic attachment
US20040209016A1 (en) * 2001-07-18 2004-10-21 Tadashi Ishida Recording medium excellent in light-resistance and method for production thereof
US20060283989A1 (en) * 2005-06-20 2006-12-21 David B. Lytle Products, Inc. Method and device for applying wall coatings
JP5298455B2 (en) * 2006-06-07 2013-09-25 コニカミノルタ株式会社 Non-aqueous inkjet ink and inkjet recording method
JP2008274034A (en) * 2007-04-26 2008-11-13 Konica Minolta Ij Technologies Inc Nonaqueous inkjet ink and inkjet recording method
JP5245361B2 (en) * 2007-11-06 2013-07-24 コニカミノルタＩｊ株式会社 Non-aqueous inkjet ink and inkjet recording method
JP5176670B2 (en) * 2008-04-23 2013-04-03 コニカミノルタＩｊ株式会社 Non-aqueous inkjet ink and inkjet recording method
CN103333281B (en) * 2013-06-20 2015-07-15 无锡洪汇新材料科技股份有限公司 Resin for blood transfusion tube/transfusion bag and preparation method thereof
CN109735215B (en) * 2018-12-19 2021-04-13 北矿科技股份有限公司 Magnetic layer and preparation method thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4851465A (en) * 1984-05-08 1989-07-25 Nippon Zeon Co., Ltd. Resin for magnetic paint
EP0385715A2 (en) * 1989-02-28 1990-09-05 Nippon Zeon Co., Ltd. Magnetic recording medium

Family Cites Families (93)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2607710A (en) * 1949-04-02 1952-08-19 Minnesota Mining & Mfg Abrasion-resistant magnetic recording tape
US3983302A (en) * 1972-05-01 1976-09-28 Cbs Inc. Magnetic recording medium
US4152485A (en) * 1977-08-05 1979-05-01 Toyo Boseki Kabushiki Kaisha Magnetic recording medium
JPS54119904A (en) * 1978-03-10 1979-09-18 Tdk Corp Magnetic recording medium
JPS54138409A (en) * 1978-04-19 1979-10-26 Tdk Corp Magnetic recording medium
JPS5570936A (en) * 1978-11-24 1980-05-28 Tdk Corp Magnetic recording media
JPS567233A (en) * 1979-06-25 1981-01-24 Tdk Corp Magnetic recording medium
JPS5845086B2 (en) * 1979-08-17 1983-10-07 ティーディーケイ株式会社 magnetic recording medium
US4436875A (en) * 1979-10-25 1984-03-13 The Dow Chemical Company Curable polymeric compositions
JPS56137522A (en) * 1980-03-26 1981-10-27 Fuji Photo Film Co Ltd Magnetic recording material
JPS5727429A (en) * 1980-07-22 1982-02-13 Tdk Corp Magnetic recording medium
JPS5730121A (en) * 1980-07-31 1982-02-18 Tdk Corp Magnetic recording medium
JPS57133521A (en) * 1981-02-10 1982-08-18 Fuji Photo Film Co Ltd Magnetic recording medium
JPS57169926A (en) * 1981-04-14 1982-10-19 Tdk Corp Magnetic recording medium
JPS57179943A (en) * 1981-04-27 1982-11-05 Tdk Corp High-density magnetic recording medium
JPS5812131A (en) * 1981-07-13 1983-01-24 Sony Corp Magnetic recording medium
US4411957A (en) * 1981-09-03 1983-10-25 Tdk Electronics Co., Ltd. Magnetic recording medium
US4423115A (en) * 1981-10-23 1983-12-27 Tdk Electronics Co., Ltd. Magnetic recording medium
US4460653A (en) * 1981-11-16 1984-07-17 Tdk Corporation Magnetic recording medium
JPS58114330A (en) * 1981-12-28 1983-07-07 Denki Kagaku Kogyo Kk Magnetic coating for magnetic recording medium
JPS58182130A (en) * 1982-04-20 1983-10-25 Fuji Photo Film Co Ltd Magnetic recording medium
JPS58211320A (en) * 1982-06-03 1983-12-08 Fuji Photo Film Co Ltd Magnetic recording material
JPS595423A (en) * 1982-07-01 1984-01-12 Sony Corp Magnetic recording medium
JPS595424A (en) * 1982-07-01 1984-01-12 Sony Corp Magnetic recording medium
JPS5924435A (en) * 1982-07-30 1984-02-08 Fuji Photo Film Co Ltd Magnetic recording medium
JPS5930234A (en) * 1982-08-10 1984-02-17 Fuji Photo Film Co Ltd Magnetic recording medium
EP0105471B1 (en) * 1982-09-30 1987-09-09 Hitachi Maxell Ltd. Magnetic recording medium
JPS5971129A (en) * 1982-10-18 1984-04-21 Fuji Photo Film Co Ltd Magnetic recording medium
JPS59104725A (en) * 1982-12-06 1984-06-16 Fuji Photo Film Co Ltd Magnetic recording medium
US4576726A (en) * 1983-01-25 1986-03-18 Toyo Tire & Rubber Company Limited Magnetic coating composition
JPH0654536B2 (en) * 1983-02-04 1994-07-20 富士写真フイルム株式会社 Magnetic recording medium
JPS59175022A (en) * 1983-03-25 1984-10-03 Fuji Photo Film Co Ltd Magnetic recording medium
DE3413080A1 (en) * 1983-04-07 1984-10-11 Fuji Photo Film Co., Ltd., Minamiashigara, Kanagawa MAGNETIC RECORDING MATERIAL
JPS59186121A (en) * 1983-04-07 1984-10-22 Fuji Photo Film Co Ltd Magnetic recording medium
JPS59218632A (en) * 1983-05-27 1984-12-08 Fuji Photo Film Co Ltd Magnetic recording medium
JPS6043218A (en) * 1983-08-18 1985-03-07 Fuji Photo Film Co Ltd Magnetic recording medium
JPS6055513A (en) * 1983-09-05 1985-03-30 Fuji Photo Film Co Ltd Magnetic recording medium
JPS6055511A (en) * 1983-09-06 1985-03-30 Toshiba Corp Magnetic recording medium
JPS6057527A (en) * 1983-09-08 1985-04-03 Fuji Photo Film Co Ltd Magnetic recording medium
JPS6079522A (en) * 1983-10-04 1985-05-07 Sony Corp Magnetic recording medium
JPS6095722A (en) * 1983-10-28 1985-05-29 Sony Corp Magnetic recording medium
JPS6098520A (en) * 1983-11-01 1985-06-01 Fuji Photo Film Co Ltd Megnetic recording medium
JPS60101161A (en) * 1983-11-08 1985-06-05 Nippon Zeon Co Ltd Magnetic paint resin
JPS60125920A (en) * 1983-12-09 1985-07-05 Fuji Photo Film Co Ltd Magnetic recording medium
JPS60144311A (en) * 1983-12-29 1985-07-30 Nisshin Kagaku Kogyo Kk Production of synthetic resin
DE3401771A1 (en) * 1984-01-19 1985-08-01 Agfa-Gevaert Ag, 5090 Leverkusen MAGNETIC STORAGE MEDIUM
JPH0619822B2 (en) * 1984-04-19 1994-03-16 ティーディーケイ株式会社 Magnetic recording medium
JPS6116016A (en) * 1984-07-02 1986-01-24 Tdk Corp Magnetic recording medium
US4600521A (en) * 1984-10-09 1986-07-15 Nippon Zeon Co., Ltd. Electron-beam reactive magnetic coating composition for magnetic recording media
JPS61113125A (en) * 1984-11-06 1986-05-31 Fuji Photo Film Co Ltd Magnetic recording medium
DE3602257C2 (en) * 1985-01-28 1995-06-14 Hitachi Maxell Magnetic recording medium
US4748081A (en) * 1985-02-23 1988-05-31 Victor Company Of Japan, Ltd. Magnetic recording medium having an improved magnetic layer using particulate alpha-Fe2 O3 and carbon black
US4798755A (en) * 1985-05-01 1989-01-17 Fuji Photo Film Co., Ltd. Magnetic recording medium
JPS626429A (en) * 1985-07-02 1987-01-13 Sony Corp Magnetic recording medium
US4731292A (en) * 1985-11-18 1988-03-15 Konishiroku Photo Industry Co., Ltd. Magnetic recording medium
US4743501A (en) * 1985-11-27 1988-05-10 Tdk Corporation Magnetic recording medium
JPS62146432A (en) * 1985-12-20 1987-06-30 Fuji Photo Film Co Ltd Magnetic recording medium
JPS62146433A (en) * 1985-12-20 1987-06-30 Fuji Photo Film Co Ltd Magnetic recording medium
JPS62159335A (en) * 1986-01-08 1987-07-15 Fuji Photo Film Co Ltd Magnetic recording medium
US5034271A (en) * 1986-02-28 1991-07-23 Fuji Photo Film Co., Ltd. Magnetic recording medium
JPH0752504B2 (en) * 1986-04-18 1995-06-05 富士写真フイルム株式会社 Magnetic recording medium
JPS62248126A (en) * 1986-04-19 1987-10-29 Fuji Photo Film Co Ltd Long-sized magnetic recording medium
JPH0743818B2 (en) * 1986-05-07 1995-05-15 松下電器産業株式会社 Magnetic recording medium
US4783370A (en) * 1986-05-28 1988-11-08 Minnesota Mining And Manufacturing Company Recording media containing alkyl acrylate copolymers
US4837082A (en) * 1986-07-31 1989-06-06 Minnesota Mining And Manufacturing Company Flexible magnetic recording media and a method using a stable fluid reactive dispersion to prepare magnetic recording media
US4876149A (en) * 1986-07-31 1989-10-24 Minnesota Mining And Manufacturing Company Magnetic recording media and a method using a stable fluid reactive dispersion in preparing magnetic recording media
JPH0785305B2 (en) * 1986-08-05 1995-09-13 富士写真フイルム株式会社 Magnetic recording medium
JPS6384879A (en) * 1986-09-25 1988-04-15 Fuji Photo Film Co Ltd Polishing tape
US4801505A (en) * 1986-10-20 1989-01-31 Fuji Photo Film Co., Ltd. Magnetic recording medium
US4847156A (en) * 1986-10-20 1989-07-11 Fuji Photo Film Co., Ltd. Magnetic recording medium
JPH0626006B2 (en) * 1987-03-25 1994-04-06 富士写真フイルム株式会社 Polishing tape
JPS63261529A (en) * 1987-04-20 1988-10-28 Fuji Photo Film Co Ltd Magnetic recording medium
US5153063A (en) * 1987-04-22 1992-10-06 Fuji Photo Film Co., Ltd. Magnetic recording medium having a vinyl-chloride resin and a urethane resin binder system each of which resins contain three percent or less of a low molecular weight resin fraction
JPH0679370B2 (en) * 1987-05-06 1994-10-05 富士写真フイルム株式会社 Magnetic recording medium
US5024892A (en) * 1987-05-08 1991-06-18 Fuji Photo Film Co., Ltd. Magnetic recording medium having a binder comprising a copolymer which includes a vinyl compound having a dialkylaminoalkyl group
JPS6439624A (en) * 1987-08-06 1989-02-09 Nisshin Kagaku Kogyo Kk Binder resin for magnetic recording medium
JP2646244B2 (en) * 1987-09-21 1997-08-27 富士写真フイルム株式会社 Magnetic recording media
JP2502639B2 (en) * 1987-12-09 1996-05-29 日信化学工業株式会社 Magnetic recording media
US5153071A (en) * 1988-04-19 1992-10-06 Fuji Photo Film Co., Ltd. Magnetic recording medium wherein the magnetic layer has as the binder system a vinyl chloride copolymer and a polyether polyurethane resin which contains a ring structure
JP2843038B2 (en) * 1988-09-24 1999-01-06 日立マクセル株式会社 Magnetic recording media
US4983311A (en) * 1988-10-26 1991-01-08 Nippon Zeon Co., Ltd. Magnetic coating and magnetic recording medium
JP2655340B2 (en) * 1989-02-28 1997-09-17 富士写真フイルム株式会社 Magnetic recording media
US5085941A (en) * 1989-03-01 1992-02-04 Minnesota Mining And Manufacturing Company Magnetic recording medium with hydroxy functional, sulfonated binder system
US5093192A (en) * 1989-03-28 1992-03-03 Konica Corporation Magnetic recording medium
FR2645317B1 (en) * 1989-03-29 1994-02-11 Sony Corp MAGNETIC RECORDING MEDIUM
JPH031315A (en) * 1989-05-29 1991-01-08 Fuji Photo Film Co Ltd Magnetic recording medium
JP2632214B2 (en) * 1989-06-08 1997-07-23 富士写真フイルム株式会社 Magnetic recording media
JP2707322B2 (en) * 1989-06-09 1998-01-28 富士写真フイルム株式会社 floppy disk
US5116683A (en) * 1989-06-14 1992-05-26 Konica Corporation Magnetic recording medium containing a specified ferromagnetic powder, polyurethane resin prepared from specified branched chain diols and a fatty acid ester
US5093172A (en) * 1989-06-26 1992-03-03 Fuji Photo Film Co., Ltd. Magnetic recording medium comprising a vinyl chloride copolymer containing a polar group and a polyurethane containing a polar group and specified aromatic or alicyclic units
JP2835747B2 (en) * 1989-09-14 1998-12-14 コニカ株式会社 Magnetic recording media
JP2850028B2 (en) * 1989-12-28 1999-01-27 コニカ株式会社 Magnetic recording media
JP2717586B2 (en) * 1989-12-28 1998-02-18 コニカ株式会社 Magnetic recording media

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4851465A (en) * 1984-05-08 1989-07-25 Nippon Zeon Co., Ltd. Resin for magnetic paint
EP0385715A2 (en) * 1989-02-28 1990-09-05 Nippon Zeon Co., Ltd. Magnetic recording medium

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EP0626678A2 (en) 1994-11-30
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KR100232244B1 (en) 1999-12-01
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EP0626678B1 (en) 1998-09-30
DE69413598T2 (en) 1999-03-04

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